CHECKING GEAR SIZES Table 4. Checking Internal Spur Gear Sizes by Measurement Between Wires ODD NUMBERS OF TEETH Dimensions in table are for 1 diametral pitch and Van Keuren standard wire sizes. For any other diametral pitch, divide dimensions in table by given pitch. Wire or pin diameter Diametral Pitch 1.44 = No. of Teeth Pressure Angle 14 1 ∕ 2 ° 17 1 ∕ 2 ° 20 ° 25 ° 30 ° 113 111.8651 111.7406 111.6541 111.5103 111.3895 115 113.8654 113.7409 113.6543 113.5105 113.3897 117 115.8657 115.7411 115.6545 115.5107 115.3899 119 117.8660 117.7413 117.6547 117.5109 117.3900 121 119.8662 119.7415 119.6548 119.5110 119.3902 123 121.8663 121.7417 121.6550 121.5112 121.3904 125 123.8668 123.7418 123.6552 123.5114 123.3905 127 125.8670 125.7420 125.6554 125.5115 125.3907 129 127.8672 127.7422 127.6556 127.5117 127.3908 131 129.8675 129.7424 129.6557 129.5118 129.3910 133 131.8677 131.7425 131.6559 131.5120 131.3911 135 133.8679 133.7427 133.6560 133.5121 133.3913 137 135.8681 135.7428 135.6561 135.5123 135.3914 139 137.8683 137.7430 137.6563 137.5124 137.3916 141 139.8685 139.7431 139.6564 139.5125 139.3917 143 141.8687 141.7433 141.6565 141.5126 141.3918 145 143.8689 143.7434 143.6566 143.5127 143.3919 147 145.8691 145.7436 145.6568 145.5128 145.3920 149 147.8693 147.7437 147.6569 147.5130 147.3922 151 149.8694 149.7438 149.6570 149.5131 149.3923 153 151.8696 151.7439 151.6571 151.5132 151.3924 155 153.8698 153.7441 153.6572 153.5133 153.3925 157 155.8699 155.7442 155.6573 155.5134 155.3926 159 157.8701 157.7443 157.6574 157.5135 157.3927 161 159.8702 159.7444 159.6575 159.5136 159.3928 163 161.8704 161.7445 161.6576 161.5137 161.3929 165 163.8705 163.7446 163.6577 163.5138 163.3930 167 165.8707 165.7447 165.6578 165.5139 165.3931 169 167.8708 167.7448 167.6579 167.5139 167.3932 171 169.8710 169.7449 169.6580 169.5140 169.3933 181 179.8717 179.7453 179.6584 179.5144 179.3937 191 189.8721 189.7458 189.6588 189.5148 189.3940 201 199.8727 199.7461 199.6591 199.5151 199.3944 301 299.8759 299.7485 299.6612 299.5171 299.3965 401 399.8776 399.7496 399.6623 399.5182 399.3975 501 499.8786 499.7504 499.6629 499.5188 499.3981 Table 5. Van Keuren Wire Diameters for Gears External Gears Wire Dia. = 1.728 ÷ D.P. Internal Gears Wire Dia. = 1.44 ÷ D.P. D.P. Dia. D.P. Dia. D.P. Dia. D.P. Dia. 2 0.86400 16 0.10800 2 0.72000 16 0.09000 2 1 ∕ 2 0.69120 18 0.09600 2 1 ∕ 2 0.57600 18 0.08000 3 0.57600 20 0.08640 3 0.48000 20 0.07200 4 0.43200 22 0.07855 4 0.36000 22 0.06545 5 0.34560 24 0.07200 5 0.28800 24 0.06000 6 0.28800 28 0.06171 6 0.24000 28 0.05143 7 0.24686 32 0.05400 7 0.20571 32 0.04500 8 0.21600 36 0.04800 8 0.18000 36 0.04000 9 0.19200 40 0.04320 9 0.16000 40 0.03600 10 0.17280 48 0.03600 10 0.14400 48 0.03000 11 0.15709 64 0.02700 11 0.13091 64 0.02250 12 0.14400 72 0.02400 12 0.12000 72 0.02000 14 0.12343 80 0.02160 14 0.10286 80 0.01800 Table 4. (Continued) Checking Internal Spur Gear Sizes Machinery's Handbook, 31st Edition
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